NL1029980C2 - Rear lighting unit and liquid crystal display device using them. - Google Patents

Rear lighting unit and liquid crystal display device using them. Download PDF

Info

Publication number
NL1029980C2
NL1029980C2 NL1029980A NL1029980A NL1029980C2 NL 1029980 C2 NL1029980 C2 NL 1029980C2 NL 1029980 A NL1029980 A NL 1029980A NL 1029980 A NL1029980 A NL 1029980A NL 1029980 C2 NL1029980 C2 NL 1029980C2
Authority
NL
Netherlands
Prior art keywords
light
emitting
units
reflecting
reflective
Prior art date
Application number
NL1029980A
Other languages
Dutch (nl)
Other versions
NL1029980A1 (en
Inventor
Ji-Whan Noh
Kye-Hoon Lee
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR1020040077596A priority Critical patent/KR100677136B1/en
Priority to KR20040077596 priority
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of NL1029980A1 publication Critical patent/NL1029980A1/en
Application granted granted Critical
Publication of NL1029980C2 publication Critical patent/NL1029980C2/en

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003Lens or lenticular sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031Reflecting element, sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068Arrangements of plural sources, e.g. multi-colour light sources

Description

Title: Backlight unit and liquid crystal display device that uses it

Background of the Invention 1. Field of the Invention The present general inventive concept relates to a backlight unit and a liquid crystal display device that uses it.

2. Description of the Related Art 10

A liquid crystal display (LCD) is a non-emissive flat panel display that requires external light to display an image because the LCD itself does not emit light. A backlight unit is placed behind the LCD to illuminate it.

15 Backlight units are classified into a direct light type of backlight unit and an edge light type of backlight unit according to the location of a light source. In the case of the direct light type backlight unit, a plurality of light sources placed under the LCD directly emits light to the LCD panel. In the case of the edge light type backlight unit, a light source disposed along an edge of a light guide panel (LGP) transmits light to the LCD panel via the LGP.

The direct light type backlight unit can use light-emitting diodes (LEDs) that emit Lambertian radiation as a light source.

1029980 2

Typically, a backlight unit with a transitive diffusion plate and a reflective diffusion plate placed above and below the LEDs, includes mirrored mirrors placed above the LEDs to prevent light emitted from the LED 5 from being directly visible above the transmissive diffusive plate . Light that is emitted by the LEDs and then reflected by reflective mirror tends to not spread wide and uniformly. Therefore, to spread the light over a wider area, the distance between the LEDs and the transmissive diffusive plate is increased, leading to a thicker backlight unit and nevertheless to poor uniformity of light distribution.

Summary of the Invention The present invention provides a thin backlight unit with improved uniformity of light distribution and a liquid crystal display (LCD) device that uses it.

Additional aspects and advantages of the current general inventive concept will be set forth in a part of the description that follows and, in part, they will be obvious on the basis of the description or may be discovered by applying the general inventive concept. . j

The aforementioned and / or other aspects of the present general inventive concept can be achieved by providing a backlight unit comprising: a plurality of light-emitting device units disposed on a base plate in a matrix, each light-emitting device unit comprising a collimator to collimate light that is emitted by a light-emitting device so that the light propagates in a main propagation direction; a plurality of 1029980 3 side reflectors disposed in the main propagation direction opposite the corresponding light-emitting device units, to reflect the incident light from the corresponding light-emitting device units in transverse directions; a reflective diffusion plate for reflecting and diffusing the light reflected from the side reflectors; and a transmissive diffusion plate disposed behind the light-emitting device units in the main propagation direction, for transmitting and diffusing the incident and reflected light.

The collimator may include a transparent body, a reflective surface formed on an outer surface of the transparent body, to reflect light emitted by the light-emitting device, and a lens portion formed in the center of the transparent body, to break the incident light.

The reflecting surface can have a parabolic shape or a conical shape. The lens portion may have a curved surface to serve as a convex lens. | i

The side reflector may be cone-shaped or curved cone-shaped to reflect uniform light in the transverse directions. The side reflectors may be placed on one surface of the transmissive diffusive plate.

Each of the light-emitting device units can emit one of red, green, and blue color beams or white light. The backlight unit can further be provided with at least one of a brightness enhancement layer (BEF) to increase the direction of the light propagating in the main direction. The backlight unit can also be provided with a polarization-enhancing layer to increase the efficiency of the polarization of light that is in increase the main propagation direction.

The foregoing and other aspects of the current general inventive concept can also be achieved by providing an LCD device comprising: a liquid crystal panel; and a backlight 30 comprising: a plurality of light-emitting device units mounted on | 1029980 4 a base plate in a matrix, wherein each light-emitting device unit is provided with a collimator for collimating light emitted by a light-emitting device so that the light propagates in a main propagation direction, a plurality of side reflectors 5 placed in a matrix above the matrix of corresponding light-emitting device units, for reflecting in a transverse direction of the light incident from the corresponding light-emitting device units, a reflective diffusion plate for reflecting, making light reflected by the side reflectors 10, and a transmissive diffusion plate placed above the light-emitting device units for transmitting and diffusing the incident and reflected light in the direction of the liquid crystal panel.

The foregoing and other aspects of the present general inventive concept can also be achieved by a method of providing back lighting to a panel, which method comprises the steps of: emitting light with a matrix of light-emitting device units placed on a base plate in a matrix, wherein each light-emitting device unit comprises a collimator for collimating light emitted by a light-emitting device, so that the light propagates in a main propagation direction; it ; reflect in transverse directions of light incident from the light-emitting units through a plurality of side reflectors disposed above each light-emitting device unit; reflecting and diffusing the transverse reflected light; and transmitting and diffusing the light in the main propagation direction.

The foregoing and other aspects of the current general inventive concept can also be achieved by providing a backlight unit provided with a base plate; a reflective diffusing plate formed on the base plate; a lot of i! * 029980 5 light-emitting device units placed on the reflective diffusing plate and spaced to emit light in a main propagation direction; a transmission diffusion plate spaced from the reflective diffusing plate; and a plurality of side reflectors 5 formed on the transmissive diffusion plate for reflecting the light from corresponding of the plurality of light-emitting device units in a transverse direction.

The foregoing and other aspects of the present general inventive concept can also be achieved by providing a method of forming a backlight unit comprising forming a base plate; forming a reflective diffusing plate formed on the base plate; placing a plurality of light-emitting device units on the reflective diffusing plate to be spaced apart so that the light-emitting units emit light in a main propagation direction; forming a transmission diffusion plate to be spaced from the reflective diffusing plate; and forming a plurality of side reflectors formed on the transmissive diffusion plate to reflect each of the corresponding light-emitting device units in transverse directions.

Brief description of the drawings

These and / or other aspects and advantages of this present general inventive concept will become clear and more directly understood with reference to the following description of embodiments together with the accompanying drawings of which:

FIG. 1 is a cross-sectional view of a backlight unit according to an embodiment of the present general inventive concept.

1079980 6

FIG. 2 is an enlarged view of a light-emitting device of the backlight unit of FIG. 1;

FIG. 3 is a perspective view of a collimator and a corresponding side reflector of the backlight unit of FIG. 1; 5 and

FIG. 4 schematically shows a liquid crystal display (LCD) device which is provided with the backlight unit of figure 1.

Detailed description of the preferred embodiments 10

Reference will now be made in detail to the embodiments of the present general inventive concept, examples of which are illustrated in the accompanying drawings in which corresponding reference numerals refer to corresponding elements. The embodiments are described below to explain the current general inventive concept with reference to the figures.

Referring to Figures 1-3, a backlight unit 100 according to an embodiment of the present general inventive concept includes a matrix of light-emitting device units 10a, 10b and 10c placed on a base plate 101 to emit light in a main propagation direction, a matrix of side reflectors 130 placed above the matrix of light-emitting device units 10a, 10b and 10c to reflect light incident from the light-emitting device units 10a, 10b and 10c in transverse directions 25 that make angles unequal to zero with the main propagation direction, an I

reflective diffusive plate 110 disposed below light-emitting device units 10a, 10b and 10c to reflect and diffuse incident light, and a transmissive diffusive plate 140 disposed above light-emitting device units 10a, 10b, and 10c to transmit incident light and diffuse.

102 1029980 7

In this context, the term "above" refers to the main direction of propagation of the light emitted from a light-emitting device 30 in each of the light-emitting device units 10a, 10b, and 10c, while the term "below" refers to an inverted direction with respect to The main propagation direction of the light substantially corresponds to a central axis of each of the three light-emitting device units 10a, 10b and 10c, that is, the direction in which the light emitted by the light-emitting device units 10a, 10b or 10c propagates along a line parallel to its central axis.

The base plate 101 serves as a substrate on which the plurality of light-emitting device units 10a, 10b and 10c are placed in a two-dimensional matrix. The base plate 101 can be a printed circuit board (PCB) for driving a light-emitting diode (LED) chip 31 in each of the light-emitting device units 10a, 10b and 10c. Alternatively, the base plate 101 may be remote from a PCT that serves to drive the light-emitting device units 10a, 10b, and 10c separately.

Each of the light-emitting device units 10a, 10b, and 10c 20 includes the light-emitting device 30 for emitting light and a collimator 50 for collimating the Lambertian light from the light-emitting device 30 so that the light propagates upwards. The light-emitting 30 comprises the LEI chip 31 to generate the light and the corresponding collimator 50. The LED chip 31 is mounted on a base 35. The LED chip 31 can be close to the collimator 50 for the amount of light that is written through by maximizing the LED chip 31 to the collimator 50.

The light-emitting device units 10a, 10b and 10c can emit red (R), green (G), and blue (B) color beams. In this case, the light-emitting device units 10a, 10b and 10c comprise LED

1029980 8 chips 31 for transmitting R, G and B color bundles, respectively. If! alternatively, the light-emitting light units 10a, 10b, and 10c can all emit white light. In this case, each of the light-emitting light units 10a, 10b, and 10c includes the LED chip 31 to generate white light.

An LCD device using the backlight unit 100 can display a color image if the light emitting light units 10a, 10b and 10c use LED chips that generate R, G and B color beams.

Although the light-emitting lightning units 10a, 10b and 10c are shown separately from each other in Figure 1, the light-emitting lightning units 10a, 10b and 10c can all emit white light.

The collimator 50 includes a transparent body 51, a reflective surface 53 to be formed on an outside of the transparent body 51 to reflect light emitted by the LED chip 31, and a lens portion 55 formed at a center from an upper portion of the body 51 and converges and deflects incident light upwards as shown in Figures 2 and 3.

The reflective surface 53 can have a parabolic or a conical shape. The reflective surface 53 can be a mirror.

When the reflecting surface has a parabolic shape, the diverging light emitted from the point-like light source (LED chip 31) and then reflected from the reflecting surface 53 is collimated into a substantially parallel light. When the reflecting surface 53 is conical, the light reflected from the reflecting surface 53 also becomes essentially a parallel beam. When the reflecting surface 53 has a parabolic shape or a cone shape, the incident light is reflected up 1029980 9 from the reflecting surface 53 with the reflected light being substantially parallel.

The lens portion 55 may have a curved surface 55a to serve as a convex lens. Because the light emitted from the LED chip 31 spreads, the curved surface 55a of the lens portion 55 causes the incident diverging light to converge and collimates this light into a substantially parallel light. A main output surface of the collimator can be provided with a curved part 55a and a flat part 55b. The light emerging from the flat portion 55b is incident on a first area of the side reflector 130, and the light emerging from the curved surface 55a is incident on a second area of the side reflector 130. A groove 55c between the flat collimator surface and the curved collimator surface prevents light emitted from the LED 30 from exiting the collimator directly through the flat surface unless the light 15 is reflected by the reflective surface 53 of the collimator.

The collimator 50 converts the diverging light that is generated from the LED chip 30 into substantially parallel light which then falls on the side reflector 130.

The side reflectors 130 corresponding to the light-emitting device units 10a, 10b and 10c are arranged in a two-dimensional matrix. The side reflectors 130 distribute the light incident from the collimator 50 of the light-emitting device units 10a, 10b and 10c in transverse directions. The side reflectors 130 may be conical or curved conical to reflect uniform light incident from the collimator 50 toward the transverse directions. In Figures 1 and 2, the matrix of the side reflectors 130 is arranged on the transmissive diffusion plate 140, but the side reflectors can also be placed on a separate transparent plate (not shown).

As described above, the backlight unit 100, which is provided with the light-emitting device units 10a, 10b and 1 029980 10 10c, each provided with a collimator 50, and the side reflectors 130 make it possible to control the majority of the light emitted. by spreading the light-emitting device units 10a, 10b and 10c over a wide area before it reaches the reflective diffusion plate 110, and thus ensures uniform brightness distribution.

The side reflectors 130 prevent transmission of a light spot placed at the position of the LED chip 31 or the color of the LED chip 31 that emits a color beam above the backlight unit 100.

At the same time, the reflective diffusion plate 110 reflects the light 10 reflected by the side reflector 130 and makes this light diffuse so that the reflected light propagates upwards.

The reflective diffusive plate 110 is mounted on the base plate 101 at the bottom of the light-emitting device units 10a, 10b and 10c. The reflective diffusive plate 110 has a plurality of holes in which the light-emitting devices 30 of the plurality of light-emitting device units 10a, 10b and 10c are disposed, respectively. The reflective diffusive plate 110 is placed on the base plate 101 with the light-emitting devices 30 positioned in the plurality of holes.

The transmissive diffusive plate 140 reflects the incident light 20 and makes it diffuse. As shown in Figs. 1 and 2, the side reflectors 130 can be both placed on the lower surface of the transmissive diffusive plate 140.

In the backlight unit 100, collimated beams are transmitted from the light-emitting device units 10a, 10b and 10c and are reflected in the transverse directions by the side reflectors 130 that are positioned above the light-emitting device units 10a, 10b and 10c, causing the beams to spread widely before they enter the reflective diffusive 110.

Thus, the backlight unit 100 has a reduced thickness compared to a conventional backlight unit because 1029980 11 the light can be uniformly distributed although the distance between the light-emitting device units 10a, 10b and 10c and the transmissive diffusive plate 140 is small.

At the same time, the backlight unit 100 further comprises a brightness enhancing layer (BEF) 150 to increase the focus of light beams escaping from the transmissive diffusive plate 140 and a polarization enhancement film 170 to increase the polarization efficiency.

The BEF 150 is used to deflect and condense the light beams escaping from the transmissive diffusive plate 140, thereby increasing the orientation and thus the brightness of the light beams. The polarization-enhancing layer 170 transmits one polarized light beam, for example a p-polarized light beam, while the other polarized beam is reflected, for example an s-polarized light beam. Thus, after being transmitted through the polarization-enhancing layer 170, the majority of the incident light beams are linearly polarized in one polarization direction, for example as p-polarized light.

A liquid crystal display (LCD) device that uses the backlight unit 100 can be provided with a liquid crystal panel mounted above the backlight unit 100. When a linearly polarized beam impinges on a liquid crystal layer in a liquid crystal panel, then the polarization of the light passing through the liquid crystal layer is rotated when an electric field is applied over the liquid crystal layer, which makes it possible to display image information. on the liquid crystal panel. Although this embodiment describes a liquid crystal layer through which a polarized beam is transmitted, the current general inventive concept is not limited thereto. The efficiency of using light can be improved if the light incident on a liquid crystal panel has a single polarization direction. That is why you can use i 1029980 12! of a polarization enhancing layer 170 for the backlight unit 100 increase the optical efficiency.

As described above, backlight unit 100 includes light-emitting device units 10a, 10b and 10c to collimate the light emitted from a matrix of point light sources, so that the collimated light propagates upwards; the side reflectors 130 reflect incident light in such a way that they are spread more widely before they reach the reflective diffusive plate 110. The backlight unit 100 having the above-described configuration is thin while ensuring uniform light distribution over the entire surface. j

Thus, an LCD device using the backlight unit 100 makes it possible to display a high quality image with a uniform brightness over the entire screen.

Figure 4 schematically shows an LCD device provided with the backlight unit 100. With reference to Figure 4, the LCD device comprises the backlight unit 100 and a liquid crystal panel 200 disposed above the backlight unit 100. The liquid crystal panel 200 is coupled to drive circuits (not shown) ). Since the details of the configuration of the liquid crystal panel 200 and the display operation using the driving circuits are well known in the art, no description is given thereof.

The present invention provides a thin backlight unit that is capable of providing a uniform light distribution. The present invention also provides an LCD device that uses a backlight unit and that produces a high quality image with a uniform brightness over the entire screen.

Although some exemplary embodiments of the present general inventive concept have been shown and described, it will be apparent to those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept, of which the scope is defined in the appended claims and their equivalents.

5, 1029980

Claims (31)

  1. A backlight unit comprising: a plurality of light-emitting device units disposed on a base plate in a matrix, each light-emitting device unit comprising a collimator to collimate light emitted by a light-emitting device so that the light propagates in a main propagation direction; a plurality of side reflectors disposed in the main propagation direction opposite the corresponding light-emitting device units, to reflect the incident light from the corresponding light-emitting device units in transverse directions; a reflective diffusion plate for reflecting and diffusing the light reflected from the side reflectors; and a transmissive diffusion plate placed in the main propagation direction behind the light-emitting device units, for transmitting and diffusing the incident and reflected light.
  2. The backlight unit of claim 1, wherein the collimator comprises: a transparent body; a reflective surface formed on an outer surface of the transparent body reflecting light from the light-emitting device; and a lens portion formed in a center of the transparent body, for reflecting the incident light.
  3. 3. Backlight unit according to claim 2, wherein the reflective surface has a parabolic or a conical shape. 1029980
  4. The backlight unit of claim 2, wherein the lens portion has a curved surface to serve as a convex lens.
  5. 5. Backlight unit as claimed in claim 2, wherein the side reflector is conical or of a curved conical shape to reflect uniform light in the transverse directions.
  6. The backlight unit of claim 2, wherein the side reflectors are placed on a surface of the transmissive diffusion plate.
  7. The backlight unit of claim 1, wherein the side reflector is cone-shaped or curved cone-shaped to uniformly reflect light beams in the transverse directions.
  8. 8. The backlight unit of claim 1, wherein the side reflectors are placed on a surface of the transmissive diffusion plate. I
  9. The backlight unit of claim 1, wherein each of the light-emitting device units emits one of red, green, and blue color beams or white light.
  10. 10. The backlight unit of claim 1 further comprising: at least one of a brightness enhancing layer (BEF) for increasing the orientation of the light traveling in the main propagation direction; and a polarization enhancing layer for increasing a polarization efficiency of the light traveling in the main propagation direction.
  11. A liquid crystal display device comprising: a liquid crystal panel; and a backlight comprising: a plurality of light-emitting device units disposed on a base plate in a matrix, each light-emitting device unit 1029980 including a collimator for collimating light emitted by a light-emitting device so that the light propagates in a main propagation direction, a a plurality of side reflectors disposed in a matrix above the matrix of corresponding light-emitting device units, for transversely reflecting light incident from the corresponding light-emitting device units, a reflective diffusion plate for reflecting, making light reflected by the side reflectors, and 10 is a transmissive diffusion plate disposed above the light-emitting device units for transmitting and diffusing the incident and reflected light in the direction of the liquid crystal panel.
  12. 12. Device as claimed in claim 11, wherein the collimator is provided with: a transparent body; a reflective surface formed on the outer surface of the transparent body and reflecting the light emitted from the light-emitting device in the main propagation direction; and a lens portion formed in a center of the transparent body and deflecting the incident light in the main propagation direction.
  13. 13. Device as claimed in claim 12, wherein the reflective surface 25 has a parabolic or conical shape.
  14. The device of claim 12, wherein the lens portion has a curved surface to serve as a convex lens.
  15. 15. Device as claimed in claim 12, wherein the side reflector is conical or of a curved conical shape to uniformly reflect light in the transverse directions. 1029980
  16. The device of claim 12, wherein the side reflectors are placed on a surface of the transmissive diffusion plate.
  17. 17. Device as claimed in claim 11, wherein the side reflector is conical or of curved conical shape to uniformly reflect light beams in the transverse directions.
  18. The apparatus of claim 11, wherein the side reflectors are placed on a surface of the transmissive diffusion plate.
  19. 19. Device as claimed in claim 11, wherein the liquid panel displays a color image and wherein each of the light-emitting device units emits one of a red, green and blue color beam or white light.
  20. 20. The apparatus of claim 11, wherein the backlight unit further comprises: at least one brightness enhancing layer (BEF) for improving the directionality of the light escaping from the transmissive diffusion plate; and a polarization enhancing layer for increasing the efficiency of light polarization.
  21. A method of providing backlighting to a panel, the method comprising the steps of: emitting light with a matrix of light-emitting device units placed on a base plate in a matrix, each light-emitting device unit comprising a collimator for collimating light that is emitted by a light-emitting device, so that the light propagates in a main propagation direction; reflecting, in transverse directions, light incident from the light-emitting units through a plurality of side reflectors disposed above each light-emitting device unit; reflecting and diffusing the transverse reflected light; and 1 02 9980 transmitting and diffusing the light in the main propagation direction.
  22. 22. Backlight unit comprising: a base plate; 5 a reflective diffusing plate formed on the base plate; a plurality of light-emitting device units disposed on the reflective diffusing plate and spaced to emit light in a main propagation direction; a transmission diffusion plate spaced from the reflective diffusing plate; and a plurality of side reflectors formed on the transmissive diffusion plate for reflecting the light from corresponding of the plurality of light-emitting device units in a transverse direction.
  23. The backlight of claim 22, wherein each of the plurality of light-emitting device units is provided with: a base; | an LED placed on the base for emitting the light; and a collimator placed on the base and LED for collimating the light to the corresponding side reflector.
  24. The backlight of claim 23, wherein the collimator comprises: a reflective surface for reflecting the emitted light; and a main surface for outputting the collimated light 25 and the emitted light in the direction of the corresponding side reflector.
  25. The backlight of claim 24, wherein the main surface is provided with a curved portion and a flat portion.
  26. 26. The backlight of claim 25, wherein a surface of each of the side reflectors is respectively provided with a first region for reflecting the light from the flat portion of the main surface and a second region for the reflect the light from the curved portion of the main surface.
  27. The backlight of claim 25, wherein the light-emitting device provides a first light and a second light and the collimator collimates the first light through the reflecting surface and the flat surface and the collimator collimates the second light through the curved surface.
  28. The backlight of claim 24, wherein the collimator is provided with a groove formed by the curved portion and a plane 10 of the flat portion to prevent light emitted from the LED from being directly output through the flat surface. i
  29. 29. The backlight of claim 24, wherein the reflecting surface forms an outer surface of the collimator between the main surface and the reflective diffusing plate for reflecting the light.
  30. The rear vent according to claim 22, further comprising: a brightness enhancing layer provided on the transmissive diffusion plate opposite the plurality of side reflectors to increase the direction of light propagating in the main propagation direction; 20 a polarization enhancing layer disposed on the brightness enhancing layer opposite the transmissive diffusion plate for enhancing selected light with one polarization direction.
  31. 31. A method of forming a backlight unit comprising: forming a base plate; forming a reflective diffusing plate formed on the base plate; placing a plurality of light-emitting device units on the reflective diffusing plate to be spaced apart so that the light-emitting units emit light in a main propagation direction; forming a transmission diffusion plate to be spaced from the reflective diffusing plate; and forming a plurality of side reflectors formed on the transmissive diffusion plate to reflect each of the corresponding light-emitting device units in transverse directions. | 1029980
NL1029980A 2004-09-25 2005-09-19 Rear lighting unit and liquid crystal display device using them. NL1029980C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020040077596A KR100677136B1 (en) 2004-09-25 2004-09-25 Back light unit and liquid crystal display apparatus employing the same
KR20040077596 2004-09-25

Publications (2)

Publication Number Publication Date
NL1029980A1 NL1029980A1 (en) 2006-03-29
NL1029980C2 true NL1029980C2 (en) 2010-05-12

Family

ID=36145047

Family Applications (1)

Application Number Title Priority Date Filing Date
NL1029980A NL1029980C2 (en) 2004-09-25 2005-09-19 Rear lighting unit and liquid crystal display device using them.

Country Status (3)

Country Link
US (1) US20060077692A1 (en)
KR (1) KR100677136B1 (en)
NL (1) NL1029980C2 (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005061431B4 (en) * 2005-02-03 2020-01-02 Samsung Electronics Co., Ltd. Side emission type LED unit
KR101237788B1 (en) * 2005-12-29 2013-02-28 엘지디스플레이 주식회사 LED lighting unit, LED back light assembly and liquid crystal display module
US7918583B2 (en) * 2006-08-16 2011-04-05 Rpc Photonics, Inc. Illumination devices
TWI287671B (en) * 2006-11-09 2007-10-01 Au Optronics Corp Diffusion plate of backlight structure and display device using the same
US20080145960A1 (en) * 2006-12-15 2008-06-19 Gelcore, Llc Super thin LED package for the backlighting applications and fabrication method
TW200839378A (en) * 2007-03-21 2008-10-01 Chi Mei Optoelectronics Corp Light emitting element, backlight module and plane display apparatus
US9040808B2 (en) * 2007-05-01 2015-05-26 Morgan Solar Inc. Light-guide solar panel and method of fabrication thereof
US9337373B2 (en) 2007-05-01 2016-05-10 Morgan Solar Inc. Light-guide solar module, method of fabrication thereof, and panel made therefrom
ES2642209T3 (en) 2007-05-01 2017-11-15 Morgan Solar Inc. Solar light guide panel and its manufacturing method
JP2008305940A (en) * 2007-06-07 2008-12-18 Showa Denko Kk Display, cap, light-emitting device, and manufacturing methods of same display, cap, and light-emitting device
TWI406013B (en) * 2008-01-14 2013-08-21 Brightness enhancement film, backlight module for using the same, and method for manufacturing the same
KR101621013B1 (en) * 2008-12-09 2016-05-16 삼성디스플레이 주식회사 Display device
KR20110114268A (en) 2010-04-13 2011-10-19 엘지전자 주식회사 Backlight unit and display apparatus comprising thereof
GB2484711A (en) 2010-10-21 2012-04-25 Optovate Ltd Illumination Apparatus
US8885995B2 (en) 2011-02-07 2014-11-11 Morgan Solar Inc. Light-guide solar energy concentrator
US8328403B1 (en) 2012-03-21 2012-12-11 Morgan Solar Inc. Light guide illumination devices
WO2016121192A1 (en) * 2015-01-28 2016-08-04 京セラコネクタプロダクツ株式会社 Light distribution means and illumination apparatus
CN105759328B (en) * 2016-05-17 2019-07-30 京东方科技集团股份有限公司 A kind of divergence of beam mechanism, backlight module and display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698730A (en) * 1986-08-01 1987-10-06 Stanley Electric Co., Ltd. Light-emitting diode
WO2001007828A1 (en) * 1999-07-21 2001-02-01 Teledyne Lighting And Display Products, Inc. Lighting apparatus
EP0944800B1 (en) * 1996-12-12 2003-06-25 Teledyne Lighting and Display Products, Inc. Lighting apparatus having low profile

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4037096A (en) * 1974-08-09 1977-07-19 American Sterilizer Company Illuminator apparatus using optical reflective methods
US5197792A (en) * 1992-04-21 1993-03-30 General Motors Corporation Illuminator device for a display panel
US5639158A (en) * 1994-08-19 1997-06-17 Nec Corporation Led-array light source
KR970028718A (en) * 1995-11-30 1997-06-24 엄길용 Light Emitting Diode Panel
US5825543A (en) * 1996-02-29 1998-10-20 Minnesota Mining And Manufacturing Company Diffusely reflecting polarizing element including a first birefringent phase and a second phase
US5803579A (en) * 1996-06-13 1998-09-08 Gentex Corporation Illuminator assembly incorporating light emitting diodes
WO1999009349A1 (en) * 1997-08-12 1999-02-25 Decoma International Inc. Bireflective lens element
KR100311861B1 (en) * 1998-07-27 2001-12-17 이종익 Structure of parallel light conversion lens
TW422346U (en) * 1998-11-17 2001-02-11 Ind Tech Res Inst A reflector device with arc diffusion uint
JP2001188230A (en) * 1999-12-28 2001-07-10 Fuji Photo Film Co Ltd Liquid crystal display device
DE10102585A1 (en) * 2001-01-20 2002-07-25 Philips Corp Intellectual Pty Mixed colour luminair with differently coloured light sources and light emission surface
DE10102586A1 (en) * 2001-01-20 2002-07-25 Philips Corp Intellectual Pty Luminair with light emission surface and punctiform light sources
KR20020080834A (en) * 2001-04-18 2002-10-26 (주)옵토니카 L.E.D. light projecting apparatus and method of fabricating the same
KR100783619B1 (en) * 2002-06-29 2007-12-07 삼성전자주식회사 Apparatus for lighting, backlight assembly and liquid crystal display having the same
JP4153370B2 (en) * 2002-07-04 2008-09-24 株式会社小糸製作所 Vehicle lighting
US6960872B2 (en) * 2003-05-23 2005-11-01 Goldeneye, Inc. Illumination systems utilizing light emitting diodes and light recycling to enhance output radiance
US7223005B2 (en) * 2003-12-23 2007-05-29 Lamb David J Hybrid lightguide backlight
KR20050113419A (en) * 2004-05-28 2005-12-02 엘지.필립스 엘시디 주식회사 Lcd back light assembly
US7083313B2 (en) * 2004-06-28 2006-08-01 Whelen Engineering Company, Inc. Side-emitting collimator
CN100437276C (en) * 2005-08-05 2008-11-26 鸿富锦精密工业(深圳)有限公司 Straight down type back light component and liquid crystal display device
US7261454B2 (en) * 2005-09-23 2007-08-28 Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. System and method for forming a back-lighted array using an omni-directional light source

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698730A (en) * 1986-08-01 1987-10-06 Stanley Electric Co., Ltd. Light-emitting diode
EP0944800B1 (en) * 1996-12-12 2003-06-25 Teledyne Lighting and Display Products, Inc. Lighting apparatus having low profile
WO2001007828A1 (en) * 1999-07-21 2001-02-01 Teledyne Lighting And Display Products, Inc. Lighting apparatus

Also Published As

Publication number Publication date
KR100677136B1 (en) 2007-02-02
KR20060028577A (en) 2006-03-30
NL1029980A1 (en) 2006-03-29
US20060077692A1 (en) 2006-04-13

Similar Documents

Publication Publication Date Title
US7139048B2 (en) Backlight assembly and liquid crystal display apparatus comprising a light guide plate having light source receiving recess and light guiding recess
KR100990813B1 (en) Illumination apparatus
US7602559B2 (en) Optical lens, light emitting device package using the optical lens, and backlight unit
JP4925642B2 (en) Backlight unit and liquid crystal display device using the same
US7210839B2 (en) Backlight system and liquid crystal display employing the same
KR101396658B1 (en) Light Cube and Flat Light Unit and Liquid Crystal Display Device including the same
JP5329548B2 (en) Thin backlight using thin side-emitting LEDs
EP1794630B1 (en) Illumination system
KR100809224B1 (en) Back light unit having a light guide buffer plate
CN102214773B (en) Light emitting device and light unit having the same
JP4123189B2 (en) Backlight device and liquid crystal display device
KR101167301B1 (en) Back light unit of liquid crystal display device
US7218830B2 (en) Surface illuminator using point light source
NL1031502C2 (en) Backlight unit and liquid crystal display that uses it.
KR100774224B1 (en) Backlight unit and liquid crystal display device using the same
TWI396904B (en) Optical package, optical lens and backlight assembly having the same
JP4153776B2 (en) Planar light source device and liquid crystal display device using the same
JP5066520B2 (en) Planar illumination device and liquid crystal display device using the same
US7039286B2 (en) Light guide module having uniform light diffusion arrangement and method for making the same
CN100421000C (en) Backlight unit and liquid crystal display employing the same
JP3955505B2 (en) Light guide plate
KR100716989B1 (en) Back light system and liquid crystal display apparatus employing it
TWI467118B (en) A light emitting device, a lighting device, and a display device
JP3994190B2 (en) Backlight
US7385653B2 (en) LED package and backlight assembly for LCD comprising the same

Legal Events

Date Code Title Description
AD1A A request for search or an international type search has been filed
RD2N Patents in respect of which a decision has been taken or a report has been made (novelty report)

Effective date: 20100311

V1 Lapsed because of non-payment of the annual fee

Effective date: 20110401